Emerson 2200S Manuel D’Utilisation

27

Figure 3-1 illustrates the mA measurement point options. As shown:

•

If your installation does not include the Micro Motion adapter-barrier, always use 12–20 mA. .

•

If your installation does include the Micro Motion adapter-barrier, be sure you know the 
location of the measurement device and set the mA measurement point appropriately:

-

If the mA measurement device is between the transmitter and the adapter-barrier, use 
12–20 mA.

-

If the mA measurement device is between the adapter-barrier and the host, use 4–20 mA.

•

If you don’t know how to set the mA measurement point, specify Don’t Know. The 
Communicator and ProLink II will display data for both output scales. 

Equations for converting between mA output scales are shown in Table 3-1.

• X = value on the 4–20 mA scale
• Y = value on the 12–20 mA scale

• X = value on the 4–20 mA scale
• Y = value on the 12–20 mA scale

12–20 mA

12–20 mA

4–20 mA

Micro Motion adapter-barrier

DCS

DCS

X

Y

10

–

(

) 2

×

=

Y

X

2

----

10

+

=